Make affirmative present perfect sentences

1) I/study/French
2) She/eat/ octopus
3) They/go/to Scotland
4) We/read/ that book
5) He/live/here for three years
6) You/know/ David for ten years
7) We/be/ here for two weeks
8) I/lose/my keys
9)He/drink/too much coffee
10) they/ miss/ the Train
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depends / this water / on / on / Earth / life / all.

All life on Earth depends on (this???) water

All life on (this??) Earth depends on water

 a / blanket / gases /of / by / surrounded / is / the / Earth.

The Earth is surrounded by a blanket of gases

 layer / the / ozone / scientists / are / about / concerned.

Scientists are concerned about the ozone layer

 lakes / to / protect / we / streams / rivers / can / oceans / help.

We can help to protect streams, rivers, lakes, and oceans

 the Earth / anyone / can / green / help / to / keep.

Anyone can help to keep the Earth green

greenhouse / trees / fight / help / effect / and us / give / oxy-gen.

Trees give oxygen and help us fight the greenhouse effect

April / 22 / day / Earth / inhabitants / of / celebrate / Earth.

The inhabitants of Earth celebrate Earth Day on April the 22nd.

 air / polluted / for / people / trees / other / plants / but / for / animals / is / not / only bad.

Polluted air is not only bad for people, but (also) for plants, trees, and other animals

 harmful / for / acid / to / plants / is / rain / rivers / live / in / creatures / them.

Acid rain is harmful to rivers, plants, and creatures that live in them

Здесь что-то не так, видимо, неудачно переписали слова. Кое-где пришлось добавить артикли и тп

 

Firstly, using computer we can do a lot of tasks in no time.
Secondly, a computer with the Internet is the thing with which we can read additional articles and electronic books. Almost all information we can find in it. Thirdly, computer also helps us to make presentations, reports and papers. Without them we would live very difficult(for example, thesis defense)
However, others think differently. They suppose a computer ruins our eyesight very much. Besides, it takes a lot of time children or students, so they become dependent computers.